+ * Copyright (c) 1999-2002 Paul Mackerras. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * 2. The name(s) of the authors of this software must not be used to
+ * endorse or promote products derived from this software without
+ * prior written permission.
+ *
+ * 3. Redistributions of any form whatsoever must retain the following
+ * acknowledgment:
+ * "This product includes software developed by Paul Mackerras
+ * <paulus@ozlabs.org>".
+ *
+ * THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO
+ * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
+ * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
+ * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
+ * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/*
+ * Paths are controlled by configure. Typically, one would pass the following options
+ * to configure:
+ * ./configure --prefix=/usr --sysconfdir=/etc --localstatedir=/var
+ *
+ * Note that if the prefix variable do control all the other directory variables, e.g
+ * sysconfdir is ${prefix}/etc. Setting prefix to /usr, you'll have to override
+ * sysconfdir with /etc to avoid installing config files into /usr/etc.
+ *
+ * In addition, there are three explicit variables that has overrides via configure:
+ * - PPPD_RUNTIME_DIR, set by --with-runtime-dir=<dir>
+ * - PPPD_LOGFILE_DIR, set by --with-logfile-dir=<dir>
+ * - PPPD_PLUGIN_DIR, set by --with-plugin-dir=<dir>